Apple has released iOS 5.0.1, an update to its mobile OS that fixes a series of issues that drained the iPhone's battery.

iOS 5.0.1 is the first update to Apple's iOS 5, which brought the notifications tray, increased performance and iCloud to the iPad, iPhone and iPod touch.

In addition to fixing the iOS battery issue, 5.0.1. adds multitouch gestures to the original iPad, fixes iCloud bugs and improves voice recognition for Australian iPhone users. This is the first OS update available both via iTunes and over-the-air.